Pulp washing and condensing apparatus



Mar. 6, 1923. 1,447,344 I. T. FISK PULP WASHING AND QONDENSING APPARATUS Filed Nov. 24, 1919 4 sheetysheet 1 1 Ji'iprney Mar. 6, 1923.-

1,447,344 1, T. FISK PULP WASH ING AND CONDENSING APPARATUS Filed No v. 3& l 9l9 4 sheets-sheet 2 Inaerzzor JM afluw ol Mar. 6, 1923. 1,447,344 I. T. FISK PULP WASHING AND CONDENSING APPA ATUS Filed Nov. 24, 1919 4.- sheets-sheet 5 Mar. 6, 1923. 1,447,344 I. T- Fls K PULP WASHING AND CONDENSING APPARATUS Filed Nov. 24,1919 4 sheets-sheet 4 mmtfmljhmjtmmm fnverzior' Patented Mar. 8, 19 23.

UNHTED STATES PATENT OFFEQE.

IRA. THOMAS FISK, OF NORTH HOOSICK, NEW

YORK, ASSIGNOR TO $TEVENS &

THOMPSON, INC, OF NORTH HOOSICK, NEW YORK, A CORPORATION OF NEW YORK.

PULP "WASHING AND CONDENSING APPARATUS.

Application filed November 24, 1919. Serial No. 340,156.

T all whom it may concern:

Be it known that 1, Ian THoMAs FISK,

a citizen ot the United States, residing at North Hoosick, in the county of Rensselaer and State of New York. have invented new and useful Improvements in Pulp Vfashing and Condensing Apparatus, of which the following is a specification.

Reference may be had to the accompanyin drawings, and the reference characters marked therein, which form a part of this specificat on. Similar characters refer to similar parts in the several figures therein.

This invention relates to the treatment of paper-pulp after the same leaves the digester. to remove from the pulp the chemical solution to the action of which the pulp was subjected in the digester.

The principal objects of the invention are to wash from the pulp the free chemicals with which the pulp is impregnated in the digesting process; and when desired to condense the pulp to any desired degree of moisture.

Other objects will appear in connection with the following description.

Fig. l of the drawings is a central vertical longitudinal section of a pulp-washing-and-condensing apparatus embodying my invention.

Fig. is a view in side elevation of the same showing the side of the apparatus having the driving means for the pulp-elevators and for the screen-vily-nting mechanism.

Fig. 3 is a top plan view of the apparatus.

Fig. -11; is a vertical cross-section of the same taken on the broken line 4-4.- in Figs. .1 and 3.

Fig. 5 is a cross-section taken on the broken line 5-5 in F 1.

Fig. 6 is a vertical longitui'linal section taken on the broken line 6-6 in Fig. 3, of

a broken-away lower end portion of the up 1 paratus showing one of the cams whereby the screen is vibrated.

Fig. 7 is a vertical cross-section taken on the broken line 77 in Fig. 6, through the cam.

Referring to the drawings wherein the in vention is shown in preferred form, 1 is a frame-work supporting a downwardly inclined series of troughs, 2, 3, st and 5, sepa rated from one another 7 and 8.

An outlet-pipe, 9, has branches leading from the trough, 5 and the trough, 3, respectively.

The partitions, 6 and T, are perforated at 10, whereby liquid may flow by gravity from the trough, 2, to the trough, 3, and from the trough, 3, to the trough, el. Liquid may flow by gravity from the trough, at, into the lower branch of the outlet-pipe, 9, and more or less liquid from the trough, 3, can flow by gravity into the upper branch of the outlet-pipe, 9. i

A. pulp-outlet pipe, 1.1, leads from the trough, 5.

A downwardly inclined screen-frame, 1.2, is pivotally mounted at its upper end at 13, upon the frame-work, 1, whereby the lower end of the frame is capable of a vertical vibrating movement.

The screen-frame, 12, carries a series of screens, 14c, 15, 16, 17 and 18, forming bottoms for respective screen-chambers or compartments formed by transverse partitions, 19, extending across the screen-frame at the lower end of the respective screens, 14, 15, 16 and 17.

Rotatively mounted in each of the compartments the bottoms of which are formed by the screens, ll, 15, 16 and 17, is a pulpeicvator, 20, in the form of a paddle-roll having a plurality of paddles, 21, carried by a shaft, 22,'rotativcly mounted inboarings in the opposite sides of the screenframe. i

The pulp-elevator, 20, extends parallel with and adjacent to the partition, 19, at the lower end of the respective screen-cone by partitions, 6,

.partment, the upper side of the partition being curved to conform to the path of movement of the paddles, 21.

The shafts, 22, project through one side of the screen-frame, and have fixed upon their projecting ends pulleys, 23, engaged by a common driving belt, 24, which passes over a pulley, E25, fixed upon a shaft, 26, rotatively mounted in hearings on the framework 1, and driven by a belt, 27, and. pulley,

The lower end of the screen-frame. 12, nornmll;- rests upon a plurality of cams,

29, through the medium of cam-followers, 30, said cams being fixed upon the shaft, 26, whereby as the shaft, 26, is rotated, the screen-frame is agitated by vertical vibrating movements.

Mounted upon the lower end of the screent'raine is a screw, 31, operated by a hand wheel, 32. and adapted to engage a seat, 33, on the framework, 1. whereby when desired the lower end of the SCI'OClbflilll'lQIndy be raised beyond the path of the cams, 29 to prevent the screen from being vibrated by the cams.

Housings, 34, carried by the screen-frame extend over the respective pulp-elevators, 20; and extending within the respective housings, 31, are water-supply nozzles in the form of pipes, 35, leading from a main supply pipe, 36, supported in brackets, 37, on the frame-work, 1.

The pipes, 35, are formed with numerous perforations directed toward the respective pulp-elevators, 20, whereby said pipes form nozzles for delivering water to the pulp being acted upon by the pulp-elevators.

A pulp-supply-box, 38, is mounted upon the frame-work, 1, at the upper end of the screen-frame, the pulp being delivered to said box from a supply-pipe, 39.

The pulp delivered by the supply-pipe, 39, to the pulp-supply-box, 38, passes through apertures, 10, in a partition, stl, within the box, and thence over a table or platform, 12, from which it falls through a slotted opening, 4L3, upon the uppermost screen, 141.

The screw. 31, being withdrawn to permit the lower end of the screen-frame to be engaged by the cams, 29, and the shaft, 26, being rotated, rapid vibrating movements will be imparted to the screen-frame and the screens mounted thereon, causing the pulp deposited upon the uppermost screen, 14, to pass more or less gradually down over said screen while much 'ot. the liquid in the pulp 'mixture flows down through the meshes of the screen into the trough, .2.

As the pulp reaches the lower end of the screen. 1 1, it is engaged by the paddle-roll, 20, adjacent to the dam, 19, between the screens 14:, and 15, whereby said pulp is elevated and passed over said dam, falling upon the next lower screen, 15.

As the pulp is being elevated by the paddles of the roll, 20. it will receive a supply of clean water from the uppermost nozzle, 35. The pulp thus deposited upon the screen, 15, contains a new supply of moisture which replaces that removed by the screen, 14;.

The operation just described with respect to screen, 1 1,is repeated with respect to each otthe screens, 15. 16, and 17, each screen removing much of the moisture from the pulp which is each time replaced by a new supply of clean water.

The pulp delivered from the screen, 17, is deposited upon the lowermost screen, 18, down which it gradually passes to an outlet, M, leading to the trough, 5, from which the pulp is delivered through the outletpipe, 11.

Each of the nozzles. is controlled by a separate valve, 45, whereby more or less water can be supplied to the pulp at the diiterent steps in its treatment.

As the pulp thus passes the series of screens it is subjected to repeated washing operations with clean water and is repeat: edly agitated and broken up by the paddle rolls, 20, as well as by the water which is forced against it by the nozzles,

The water removed from the pulp by the several screens passes into one or another of the troughs, 2, 3, and a, whence it escapes through the outlet pipe, 9.

The pulp is delivered to the trough, 5. practically free from chemical solutions; and by regulating or limiting the supply of water from the respective nozzles, 35, the density of the delivered pulp can be regulated as desired within reasonable limits.

lVhile I have described my invention in its preferred application to the treatment of digested wood pulp, it is adapted for treating various kinds of paper pulp for washing or condensing the same, and the ele ating and delivering of the pulp in its passage from an upper to a lower screen serves to break up the mass of pulp to provide for a more thorough washing of the same by the successive application of clean water as above described as well as to extracting the moisture from the pulp when it is desired to condense the pulp.

By suitable adjustment of the screw, 31, the screen-frame can be either wholly or partly withdrawn from the path of the cams, 29, thus affording a means for either discontinuing or varying the, amplitude of the vibrating movements of the screen-frame.

\Vhat I claim as new and desire to secure by Letters Patent is 1. In an apparatus of the class described and in combination, a downwardly inclined screen frame; means for agitating said frame; a series of downwardly inclined screens arranged longitudinally of said frame; transverse damsinterposed between neighboring screens; paddle-rolls rotatively mounted upon said screeirframe adjacent to the upper side of the respective dams; means for rotating said paddle-rolls to raise the pulp over the respective dams; watersupply nozzles directed toward the respective paddle-rolls; means for delivering pulp to the uppermost screen of the series; and means whereby pulp is delivered from the lowermost screen in the series.

2. In an apparatus of the class described and iii-combination, a supporting framework; a downwardly inclined screen-frame; means for agitating said frame; a series of downwardly inclined screens arranged longitudinally of said frame with a puipwlelive-ring opening at the lower end at the lowermost screen; troughs supported upon said frame-work beneath said screens, the lowermost trough being in position to receive the pulp through said opening from, the lowermost screen; outlets tor the respectii'e troughs; transverse dams interposed between neighboring screens; paddle-rolls rotatively mounted upon said screen-frame adjacent to the upper side oi the respective dams; means for rotating said paddle-rolls to raise the pulp over the respective dams; water-supply nozzles directed toward the respective paddle-rolls; and means for delivering pulp to the uppermost screen of the series.

In an apparatus of the class described and in combination, asupporting framework; a downwardly inclined screen-frame pivotally mounted at its upper end upon said frame-work; a cam for vibratii'ig the screen-fran'ie; means for rotatii'ig said cam; a screw mounted upon the lower end of said screen-:t'rame; a seat on said frame-work adapted to be engaged by said screw whereby the screen-frame can be raised out of the path of said cam; a series of downwardly inclined screens arranged longitudinally of the screen-frame; transverse dams inter posed between neighboring screens; paddlerolls rotatively mounted upon said screeir frame adjacent to the upper side of the respective dams; means for rotating said paddle-rolls to raise the pulp over the respective dams; water-supply nozzles directed toward the respective paddle-rolls; and means for delivering pulp to the uppermost screen of the series.

4;. In an apparatus of the class described and in combination, a downwardly inclined lower screen; an upper screen downwardly inclined toward said lower screen; means for delivering pulp at the upper end of the upper of said screens; means whereby pulp is delivered from the lower end of the lower of said. screens; a dam interposed between said screens; and pulp-elcvating mechanism at the lower end of said upper screen adjacent to the upper side of said dam.

5. In an apparatus of the class described and in combination a downwardly inclined screen-frame; means for agitating" said frame; a series of downwardly inclined screens arranged longitudinally of said frame; transverse dams interposed between neighboring screens; pulp-elevating mechanism adjacent to the upper sides of the respective dams whereby pulp is raised to pass thereoyer; means for supplying pulp to the uppermost screen of the series; and means whereby pulp is delivered from the lowermost screen of the series.

6. In an apparatus of the class described and in combination. a downwardly inclined lower screen; an upper screen downwardly inclined toward said lower screen; means for delivering pulp at the upper end of the upper 01? said screens; means whereby pulp is delivered from the lower of said screens; a dam interposed between said screens; pulpelevating mechanism at the lower end of the upper screen adjacent to the upper side of said dam; means for vibrating said screens; and means whereby the an'iplitude of vibratory movement of said screens can be Varied.

In testimony whereof, I have hereunto set my hand this 19th day of November 1919.

IRA THOMAS FISK. 

